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Why doesn't Python have a sign function?
...;>> math.copysign(1, -4)
-1.0
>>> math.copysign(1, 3)
1.0
If you get sick of passing two whole arguments, you can implement sign this way, and it will still be compatible with the IEEE stuff mentioned by others:
>>> sign = functools.partial(math.copysign, 1) # either of th...
Ignore .pyc files in git repository
...
Put it in .gitignore. But from the gitignore(5) man page:
· If the pattern does not contain a slash /, git treats it as a shell
glob pattern and checks for a match against the pathname relative
to the location of the .gitignore file (relative to the toplevel of
th...
Parse a URI String into Name-Value Collection
...
If you are looking for a way to achieve it without using an external library, the following code will help you.
public static Map<String, String> splitQuery(URL url) throws UnsupportedEncodingException {
Map<Stri...
Check if class already assigned before adding
In jQuery, is it recommended to check if a class is already assigned to an element before adding that class? Will it even have any effect at all?
...
.gitignore for PhoneGap/Cordova 3.0 projects - what should I commit?
...he answer depends on wich platforms you're developing the phongap app, and if you're following the standard directory structure.
If your project directory structure is standard, then you can start from this gitignore and modify it for your needs.
On a rule of thumb you've to exclude all generated ...
Check whether variable is number or string in JavaScript
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If you're dealing with literal notation, and not constructors, you can use typeof:.
typeof "Hello World"; // string
typeof 123; // number
If you're creating numbers and strings via a constructor, such as var foo ...
How to execute a file within the python interpreter?
...ral ways.
From the shell
python someFile.py
From inside IDLE, hit F5.
If you're typing interactively, try this: (Python 2 only!)
>>> variables= {}
>>> execfile( "someFile.py", variables )
>>> print variables # globals from the someFile module
For Python3, use:
&...
How do I check whether a file exists without exceptions?
How do I check if a file exists or not, without using the try statement?
39 Answers
...
how to get first three characters of an NSString?
...
note: "Range or index out of bounds" error possible if you don't check the length to make sure it has 3 or more characters long
– Ryan Bavetta
Mar 29 '12 at 4:01
...
Pythonic way to create a long multi-line string
... quotes to start and end them.
s = """ this is a very
long string if I had the
energy to type more and more ..."""
You can use single quotes too (3 of them of course at start and end) and treat the resulting string s just like any other string.
NOTE: Just as with any string, anyt...